Tectono-Magmatic Precursors for Porphyry Cu-(Mo-Au) Deposit Formation

SIMS zircon U–Pb and molybdenite Re–Os geochronology, Hf isotope, and whole-rock geochemistry of the Wunugetushan porphyry Cu–Mo deposit and granitoids in NE China and their geological significance

“…Chen et al, 2008;Santosh, 2010;Santosh et al, 2011;Deng et al, 2013a, b;Zhai and Santosh, 2013;Deng et al, 2014;Zhai, 2014). With respect to giant porphyry deposits, previous studies have shown that they generally occurred in subduction-related continental-and islandarc settings, which have been considered as a particularly favorable tectonic setting for the generation of Cu-Mo deposits (Sillitoe, 1972;Richards, 2003;Cooke et al, 2005;Seedorff et al, 2005;Shen et al, 2012;Y. Wang et al, 2014b).…”

Petrology of the Miocene igneous rocks in the Altar region, main Cordillera of San Juan, Argentina. A geodynamic model within the context of the Andean flat-slab segment and metallogenesis

“…We suggest that this increased compression in the lithosphere may have hindered the upward ascent of the USS magmas and favored their pooling in chambers within the crust (see Richards et al, 2001;Richards, 2003, see also Chiaradia et al, 2009a and b). This explanation correlates with the local magmatic gap from w20 Ma to 12 Ma in Altar region and with the switch from voluminous extrusive magmatism (LVC) to reduced intrusive magmatism (USS).…”

“…As proposed by Tosdal and Richards (2001) changes in subduction geometry and convergence rates produced a shift in the locus of deformation relative to magmatism. We argue that the collision ridge-trench at w11 Ma in this latitude and the subduction of the JFR beneath Altar region at w11e10 Ma produced changes in the tectonic stress regime, promoting faulting and a relaxation of the horizontal stress in the lithosphere that permitted the USS magmas to rise to shallow levels in the crust (see Richards, 2003).…”

Geology and geochemistry of the Mendejin plutonicrocks, Mianeh, Iran

“…It appears that the behavior of gold in magma is chiefly controlled by fO 2 . In the oxidized magmas, sulfur is dominantly present as sulfate and therefore, chalcophile elements such as Au are retained in the melt (Richards, 2003). In a reduced magma, such as that of the pyrite-bearing Mendejin pluton, fS 2 is high and gold is scavenged by sulfide minerals from the early stages of sulfide differentiation.…”